Connected sums of sphere products and minimally non-Golod complexes
A simplicial complex K is called minimally non-Golod if its Stanley--Reisner ring is not Golod but becomes so after removing any one of the vertices of K. In this talk, we discuss the relationship between minimally non-Golodness and the condition that the moment-angle complex ZK is homotopy equivalent to a connected sum of sphere products. We show that if ZK is homotopy equivalent to a connected sum of sphere products with two spheres in each product, then K is the join of an n-simplex and a minimally non-Golod complex. In particular, K is minimally non-Golod for every moment-angle manifold ZK homeomorphic to such a connected sum.